AS3 - Events are no longer received after adding a preloader swf

Question

This was my initial structure: main.swf -> child.swf

Main loads various child swfs. I am dispatching events from the child swfs, and main is listening for the events. Everything was working great.

Then, I added a preloader swf, so now the structure is: loader.swf -> main.swf -> child.swf

I did not change the relationship between main and child at all, but now events dispatched by the child are no longer received by main. I know they are getting dispatched (using Console.log). Bubbling is set to true. Why would main no longer receive events from a child just because I wrapped everything with a loader?

EDIT: I tried changing useWeakReference to false, in case the listener was getting garbage collected:

this.addEventListener(MyEvent.HELP_ME, imDesperate, false, 0, false);

That didn't make any difference.

Answer 1

For the benefit of others visiting this question, the answer is to do with the ApplicationDomain (overview here) and was solved here.